port spreadsheet engine for iOS [closed]

I'm going to port the spreadsheet engine to iOS platform. I was just wondering is there anyone here who once did the same work before? Or could someone give me some directions/suggestions to do so?

Regarding of the spreadsheet engine, I mean I do not need any GUI or no any UI related logic and functionality. What I am going to do is try to build a lib which
1) has the ability to load Microsoft excel file. (xls eg).
2) support most of the excel formula,
3) if I change the value of specific cell or a range programly, it will calculate all related formula. And I could get all affected cells and their new value programly.

My best suggestion is to hop on IRC or the mailing list and ask for information about LO + iOS. If you don't get an immediate response, see if one of the devs listed in the version control history (links above) can point you in the right direction.